Tunable fiber bundle integrated optical measurement rod and testing method

Abstract

This invention relates to the field of microscopic spectroscopy testing technology, specifically a tunable fiber bundle integrated optical measuring rod and testing method. The rod includes a carbon fiber shell-shaped main body, an optical fiber bundle fixedly mounted at the top of the main body, a focusing stage fixedly mounted at the bottom of the main body, a sample holder fixedly placed on the focusing stage, and an optical fiber collimator fixedly positioned above the sample to be tested. A laser is connected to the input end of the fiber bundle head, and a detector is connected to the output end. The tail of the fiber bundle is fixedly mounted on the optical fiber collimator. The position and angle of the focusing stage are adjustable. The sample to be tested is fixedly placed on the sample holder, and a power line is connected to the main body to supply power to the sample holder. This invention features a simple structure, convenient operation, adjustable focusing stage position and angle, good optical testing light collection efficiency, and the ability to perform optical measurements of samples and multifunctional transmission optical path testing using the fiber bundle as a carrier. It also boasts high detection efficiency and stable performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of microscopic spectral testing, in particular to a tunable fiber bundle integrated optical measurement rod and a testing method. BACKGROUND

[0002] With the development of steady-state and pulsed magnet technology and the construction of strong magnetic field experimental devices, it has become an urgent problem to develop corresponding experimental detection technology under strong magnetic field for the research of strong magnetic field material science. Optical means has important applications in the scientific research of physics, chemistry, materials, biology and other fields under strong magnetic field due to its advantages of fast speed, high sensitivity, anti-electromagnetic interference, and the ability to perform ultrafast time resolution and fine energy resolution measurement.

[0003] The design of optical measurement methods and devices under strong magnetic field is restricted by the magnetic field environment and the running state of the magnet. First, in order to obtain a stronger magnetic field under a unit current, the magnet aperture is often small (centimeter level), which cannot accommodate conventional optical elements and measurement devices; second, in order to prevent the influence of leakage magnetic field on the measurement device, the light source, detector and other system components should be as far away from the magnet as possible, at the same time, the magnet often runs with vibration caused by cooling water circulation, compressor, etc., and the traditional free optical path cannot guarantee the relative stability between the system parts in long-distance optical signal transmission, and is easy to introduce interference light from the environment; third, the running of the magnet needs to consume a large amount of water, electricity, low-temperature liquid and other resources, and the limited installed capacity cannot support the long-time running of the magnet, so it is necessary to improve the working efficiency of the test system; fourth, the optical research under strong magnetic field often involves multiple testing methods such as fluorescence measurement, polarization measurement, electrical measurement and other functions under the same test conditions and the same sample, which are designed separately and measured individually, which is complicated and inefficient, and also cannot guarantee the consistency of the test conditions.

[0004] At present, the Chinese invention patent with the publication number CN105911029B discloses a system for measuring photoluminescence of a sample under deep cryogenic strong magnetic field, which directly puts the sample rod integrated with an optical transmission system into the cavity of the low-temperature strong magnetic field to test the photoluminescence of the sample in the deep cryogenic and strong magnetic field environment. The above-mentioned scheme solves the problem of placement in a small-aperture magnet, but in the testing process, the optical fiber cannot accurately position the testing position, and it is difficult to test the specific area of the sample, which affects the spectral collection efficiency and leads to low detection efficiency; and the function of the system is single, which can only realize optical measurement and cannot guarantee the consistency of the test conditions.

[0005] Therefore, it is particularly important to design an optical measurement device that can solve the above problems for the research of physical properties under strong magnetic field and similar environment. SUMMARY

[0006] The technical problem to be solved by this invention is how to provide a tunable fiber bundle integrated optical measuring rod that facilitates microscopic spectral measurement in a low-temperature, high-magnetic-field environment in a confined space. It has a simple structure, good light collection efficiency, high detection efficiency, and stable performance.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] A tunable fiber optic bundle integrated optical measuring rod includes a rod body, a fiber optic bundle, a focusing stage, a sample holder, and a fiber optic collimator. The rod body is a carbon fiber shell. The head of the fiber optic bundle is fixedly mounted on the top of the rod body, with a laser connected to the input end and a detector connected to the output end. The focusing stage is fixedly mounted on the bottom of the rod body, and its position and angle are adjustable. The sample to be tested is fixedly placed on the focusing stage via the sample holder, and a power line supplying power to the sample holder is connected to the rod body. The fiber optic collimator is fixedly positioned above the sample to be tested, and the tail of the fiber optic bundle is fixedly mounted on the fiber optic collimator.

[0009] Beneficial effects: The test sample, fiber optic bundle, focusing stage, sample holder, and fiber optic collimator are all installed inside the rod body, which has a simple structure and is easy to place in a confined space with a low temperature and strong magnetic field. During testing, an electric field is applied to the test sample through the power line to perform electrical measurements, which helps to ensure the consistency of test conditions. The laser beam is directed from the laser to the fiber optic bundle, and the laser beam passes through the fiber optic collimator to illuminate the surface of the test sample. The test signal generated by the test sample enters the detector through the fiber optic bundle. By observing the test sample through the detector and adjusting the position and angle of the focusing stage, the test sample can be moved to the laser spot, so that the light collection efficiency of the fiber optic bundle is optimized, improving the signal-to-noise ratio of the test. Moreover, the fiber optic collimator is placed directly above the sample, reducing the transmission loss of light through optical elements in free space, which helps to ensure the strength of the detection signal. In addition, the rod body is a shell made of carbon fiber. Carbon fiber has excellent electromagnetic shielding properties, is lightweight, and is not easily deformed in low temperature environments, ensuring the stability of the test. Therefore, the measuring rod of this application has the advantages of good light collection efficiency, high detection efficiency, and stable performance.

[0010] Preferably, the focusing positioning stage includes a fixed base fixedly installed inside the rod body, a first rotating stage rotatably connected to the fixed base, a second rotating stage rotatably connected to the first rotating stage, and a sample holder slidably disposed on the second rotating stage, wherein the sample holder is fixedly installed on the sample holder; the first rotating stage, the second rotating stage, and the sample holder are all made of piezoelectric ceramic, and a controller for controlling the degree of deformation of the piezoelectric ceramic is provided outside the rod body.

[0011] Beneficial effects: Piezoelectric ceramics are a type of electronic ceramic material with piezoelectric properties. Under the influence of an electric field, they can deform, enabling the conversion of mechanical and electrical energy. The degree of deformation varies depending on the input voltage. When adjusting the focusing stage, the voltage of the sample holder is controlled by a controller, causing frictional coupling between the sample holder and the second rotating stage. This propels the sample holder to move horizontally or vertically, thus adjusting its position. Similarly, controlling the voltage of the first or second rotating stage causes localized deformation and rotation at its bottom, resulting in angle adjustment of the sample holder, achieving the purpose of adjusting the position and angle of the focusing stage.

[0012] Preferably, both the fixed base and the top surface of the first rotating platform are provided with U-shaped grooves, the central axes of the two U-shaped grooves are horizontal and perpendicular to each other, and the bottoms of the first rotating platform and the second rotating platform are both U-shaped to cooperate with the U-shaped grooves.

[0013] Beneficial effects: When adjusting the angle of the focusing positioning stage, the first and second rotary stages rotate around the X and Y axes on the horizontal plane in the corresponding U-shaped grooves. The cooperation between the U-shaped bottom of the rotary stage and the U-shaped groove, as well as the separate adjustment method, facilitates the precise adjustment of the angle of the focusing positioning stage.

[0014] Preferably, a cable box is fixedly connected to the top of the pole body, and a top cover is detachably connected to the opening at the top of the cable box. The top cover is provided with an interface for the optical fiber cable to pass through. An inner sleeve for arranging the optical fiber cable is installed below the cable box. The inner sleeve is located inside the pole body and extends towards the optical fiber collimator.

[0015] Beneficial effects: During installation, first insert the fiber optic bundle, power cord, and controller cable into the inner sleeve. Then, open the top cover and install the inner sleeve onto the cable box. Next, connect the laser cable and detector cable to the fiber optic bundle through their respective interfaces. The power cord and controller cable should exit the cable box through their respective interfaces and be connected to the corresponding power supply and controller. Finally, close the top cover to complete the installation. The cable box and inner sleeve organize and store the cables of each component, making the measuring rod simple and easy to access. Components such as the laser, detector, power supply, and controller can be connected to the measuring rod through their respective cables and interfaces, allowing them to be placed as far away from the magnet as possible. This effectively solves the problem of sample drift caused by external vibration and improves the stability of the test.

[0016] Preferably, a sealing gasket is provided between the top cover and the cable box; sealing rings are fixedly connected to the inner wall of the interface and the inner wall of the inner sleeve inlet and outlet.

[0017] Beneficial effects: The sealing gasket seals the gap between the top cover and the cable box, and the sealing ring ensures a good seal between each cable and the interface and the inner sleeve, thereby maintaining the airtightness inside the measuring rod and preventing air from affecting the propagation of the laser in the fiber bundle, which helps to improve the accuracy of the test results.

[0018] Preferably, the sample holder includes a tray, an electrode, and a terminal block. The sample to be tested is fixedly placed on the tray. One end of the electrode is fixedly mounted on the tray, and the other end is pressed onto the sample to be tested. The terminal block is fixedly mounted on the tray, and the terminal block is electrically connected to the electrode and the power cord.

[0019] Beneficial effects: After the sample holder is placed, connect the power cord to the terminal block; when performing electrical measurements, turn on the power supply, and the power supply will supply power to the terminal block through the power cord. The current will be conducted to the electrode through the terminal block. Since the electrode is pressed on the sample to be tested, the electrode will apply an electric field to the sample to be tested, thereby achieving the purpose of electrical measurement.

[0020] Preferably, multiple electrodes are evenly distributed along the circumference of the sample to be tested; the electrodes are made of irregularly shaped copper sheets with one end pointed, and the tip of the electrode is pressed onto the sample to be tested.

[0021] Beneficial effects: When placing the sample to be tested, the irregularly shaped electrode is moved to cause it to elastically deform and the tip of the electrode is pressed onto the sample to be tested. The restriction of the electrode makes the sample to be tested stably fixed on the tray. When the power is applied, the charge is concentrated at the tip of the irregularly shaped copper sheet, and tip discharge occurs, which enhances the electric field around the sample to be tested and ensures the electrical measurement effect.

[0022] Preferably, the fiber optic collimator is detachably installed inside the pole body via a support column and a connecting plate. The support column is threaded into the pole body, and one end of the connecting plate is sleeved on the fiber optic collimator, while the other end is sleeved on the support column.

[0023] Beneficial effects: Since the focusing and positioning stage is a fine adjustment of the displacement stage, for the testing of products with large variations in sample thickness, it is necessary to adjust the height of the fiber collimator. At this time, the height of the fiber collimator can be quickly adjusted by changing the support column of different lengths, which is quick and convenient and expands the scope of application of this application.

[0024] The present invention also provides a testing method using a tunable fiber bundle integrated optical measuring rod, comprising the following steps:

[0025] (1) Placing the sample: After installing the fiber bundle, focusing platform and fiber collimator in the rod body, the sample to be tested is fixedly placed on the sample holder and the sample holder is fixedly placed on the focusing platform so that the sample to be tested is located below the fiber collimator. Then the power line is connected to the sample holder and the measuring rod with the sample to be tested is placed into the low temperature strong magnetic field cavity.

[0026] (2) Debugging: Turn on the laser and let it irradiate the input end of the fiber bundle. The laser irradiates the surface of the sample under test through the fiber bundle and the fiber collimator. The sample under test generates a test signal and returns to the fiber bundle along the original path. Then, it enters the detector through the output end of the fiber bundle. At this time, observe the sample under test through the detector. At the same time, adjust the position of the focusing stage to move the sample under test to the laser spot. Adjust the angle of the focusing stage to maximize the signal intensity.

[0027] (3) Testing: After debugging, turn on the power supply to supply power to the sample holder through the power cord. Change the electric field strength to perform electrical measurements. According to the set detection area and interval step, make the sample to be tested move in a scanning manner on the focusing positioning stage. That is, after collecting the information of each sample point, move the next measurement point of the sample to be tested to the laser spot to realize multiple single-point detection of the sample to be tested.

[0028] Beneficial effects: During testing, the sample to be tested is installed inside the assembled rod body and placed together with the rod body in a confined space with a low-temperature, high-magnetic field. Then, the laser is turned on to illuminate the fiber optic bundle. The test signal generated by the sample can be observed through the detector. At this time, the position and angle of the focusing stage are adjusted, and the sample to be tested moves with the focusing stage to the laser spot. The adjustment is completed when the light collection efficiency of the fiber optic bundle is optimal, effectively solving the problem of sample defocusing. During testing, according to the set detection area and interval step, the sample to be tested is scanned and moved with the focusing stage according to the adjustment method, so that multiple single-point detections of the sample to be tested can be performed to achieve microscopic spectral measurement. Power is supplied to the sample holder through the power line to apply an electric field to the sample to be tested. By changing the electric field strength, electrical measurements can be performed. Turning on other light sources of the laser, such as illumination light and imaging devices, can realize multi-functional transmission optical path testing with fiber optic bundle as carrier. Multiple tests can be performed on the same sample under the same test conditions, which helps to ensure the consistency of test conditions. The operation is convenient and the performance is stable.

[0029] Preferably, in step (3), during the testing process, the debugging of step (2) is performed once every 5-10 detection points are collected.

[0030] Beneficial effects: Since the surface of the sample to be tested is not necessarily perfectly horizontal, and the sample may also vibrate during the test, the cumulative effect of multiple measurements may cause the measurement point to deviate from the focal plane of the fiber collimator. However, by adjusting the measurement every 5-10 detection points, the detection efficiency is ensured and the signal strength of the collected signal is kept at its maximum, which is beneficial to improving the signal-to-noise ratio.

[0031] The advantages of this invention are:

[0032] 1. This application has a simple structure and is easy to place in a low-temperature, strong magnetic field environment in a confined space. During testing, by adjusting the position and angle of the focusing and positioning stage, the sample to be tested is moved to the laser spot, so that the light collection efficiency of the fiber bundle reaches the optimal level, resulting in good light collection efficiency and high detection efficiency.

[0033] 2. This application utilizes the information function of piezoelectric ceramics to convert mechanical energy and electrical energy into each other. By controlling the voltage of the sample holder and two rotating stages through a controller, the sample holder is moved or deformed, thereby adjusting the angle of the sample holder position and thus achieving the purpose of adjusting the position and angle of the focusing stage.

[0034] 3. This application supplies power to the sample holder via a power cord, and electrical measurements can be achieved by changing the electric field strength; turning on the laser allows for the transmission of laser light, illumination light, etc., and / or imaging, realizing multifunctional transmission optical path testing with fiber bundle as carrier, enabling multiple tests on the same sample under the same test conditions, with convenient operation and stable performance. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0036] Figure 2 for Figure 1 A magnified view of part A in the image.

[0037] Figure 3 for Figure 1 A magnified view of part B in the image.

[0038] Figure 4 This is a schematic diagram of the optical fiber bundle in Embodiment 1 of this application.

[0039] Figure 5 This is a schematic diagram of the focusing positioning stage in Embodiment 1 of this application.

[0040] Figure 6 This is a schematic diagram of the sample holder in Embodiment 1 of this application.

[0041] Figure 7 This is a cross-sectional view of the fiber collimator in Embodiment 1 of this application.

[0042] Figure 8This is a schematic diagram of the overall structure of Embodiment 3 of this application.

[0043] Figure 9 This is a cross-sectional view of Embodiment 3 of this application.

[0044] Reference numerals: 1. Rod body; 11. Cable box; 111. Top cover; 112. Interface; 113. Inner convex sleeve; 114. Limiting groove; 12. Inner sleeve; 121. Outer convex part; 122. Fixing nut; 123. Limiting block; 13. Base; 131. Placement groove; 14. Sealing gasket; 15. Sealing ring; 2. Focusing positioning stage; 21. Fixing seat; 22. First rotating stage; 23. Second rotating stage; 24. Sample holder; 3. Sample tray; 31. Tray plate; 32. Electrode; 33. Terminal; 4. Fiber optic collimator; 41. Housing; 42. Lens; 43. Polarizer; 5. Connecting frame; 51. Support column; 52. Connecting plate. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1

[0047] This embodiment discloses a tunable fiber bundle integrated optical measuring rod. (Refer to...) Figure 1 , Figure 2 The tunable fiber bundle integrated optical measuring rod includes a rod body 1, a fiber bundle, a focusing stage 2, a sample holder 3, and a fiber collimator 4. The rod body 1 is a cylindrical shell made of carbon fiber, but can also be made of aluminum, stainless steel, etc.

[0048] Reference Figure 1 , Figure 3 A cable box 11 is fixedly connected to the top of the pole body 1. The cable box 11 is cylindrical, and a top cover 111 covers its top opening. The top cover 111 has four interfaces 112, namely a power interface 112, an optical fiber input interface 112, an optical fiber output interface 112, and a displacement stage control interface 112. An inner sleeve 12 is provided inside the pole body 1, and the length direction of the inner sleeve 12 is consistent with the length direction of the pole body 1. The top end of the inner sleeve 12 is fixed to the cable box 11 and communicates with the interior of the cable box 11; the bottom end of the inner sleeve 12 extends to the lower part of the pole body 1.

[0049] Reference Figure 4The fiber optic bundle uses an existing Y-type fiber optic bundle, with its head fixedly installed inside the cable box 11. The upper end of the fiber optic bundle includes an input end and an output end, and the connector of the fiber optic bundle uses an FC-APC connector. The input end of the fiber optic bundle is connected to a laser, and the input end of the fiber optic bundle is divided into three bundles. The three fiber bundles are respectively connected to the laser connector, illumination connector, and imaging connector of the laser. Turning on the laser enables laser illumination, illumination, and / or imaging. The output end of the fiber optic bundle is correspondingly connected to a detector for signal acquisition. The laser and detector are placed as far away from the magnet as possible. The laser is connected to the fiber optic bundle through a laser line and a fiber optic input interface 112, and the detector is connected to the fiber optic bundle through a detector line and a fiber optic output interface 112. Both the laser line and the detector line are made of fiber optic cable, and the ends of the laser line and the detector line connected to the fiber optic bundle are arranged inside the cable box 11.

[0050] Reference Figure 1 , Figure 5 The bottom of the rod body 1 is a base 13, and a placement groove 131 is provided at the lower part of the rod body 1. The base 13 communicates with the outside through the placement groove 131. The focusing positioning stage 2 is placed inside the base 13. The focusing positioning stage 2 includes a fixed seat 21, a first rotating stage 22, a second rotating stage 23, and a sample holder 24 arranged in sequence. The fixed seat 21 is fixedly placed inside the base 13. A first U-shaped groove is provided on the top surface of the fixed seat 21, and a second U-shaped groove is provided on the top surface of the first rotating stage 22. The central axes of the first U-shaped groove and the second U-shaped groove are respectively arranged along the X-axis and Y-axis directions of the horizontal plane. The bottom cross-section of the first rotating stage 22 is U-shaped, and it rotates and fits in the first U-shaped groove; the bottom cross-section of the second rotating stage 23 is U-shaped, and it rotates and fits in the second U-shaped groove; the sample holder 24 is slidably disposed on the top surface of the second rotating stage 23.

[0051] Reference Figure 5The first rotating stage 22, the second rotating stage 23, and the sample holder 24 are all made of piezoelectric ceramics. Piezoelectric ceramics are capable of deformation under the action of an electric field. A controller is provided on the outside of the rod body 1 to control the voltage of the piezoelectric ceramics. By changing the voltage of the piezoelectric ceramics through the controller, the degree of deformation of the piezoelectric ceramics can be controlled. By controlling the voltage of the sample holder 24 through the controller, the sample holder 24 and the second rotating stage 23 are frictionally coupled, thereby pushing the sample holder 24 to move horizontally or vertically, thus adjusting the position of the sample holder 24. By controlling the voltage of the first rotating stage 22 through the controller, its bottom undergoes local deformation and rotates around the X-axis within the first U-shaped groove. Similarly, by controlling the voltage of the second rotating stage 23 through the controller, its bottom undergoes local deformation and rotates around the Y-axis within the second U-shaped groove, thereby adjusting the angle of the sample holder 24, thus achieving the purpose of adjusting the position and angle of the focusing positioning stage 2. Furthermore, the rotation angles of the first rotating stage 22 and the second rotating stage 23 are both within the range of ±5°, and the size of the fixed base 21 does not exceed 30mm*30mm, which is conducive to the precise adjustment of the angle of the focusing positioning stage 2. At the same time, the focusing positioning stage 2 can work under extreme conditions such as magnetic field strength greater than 20T and ambient temperature greater than 4K.

[0052] Reference Figure 6 The sample holder 3 includes a tray 31, electrodes 32, and terminals 33. The tray 31 is rectangular and is fixedly placed on the top surface of the sample holder 24. Both electrodes 32 and terminals 33 are made of brass and have good conductivity. Electrodes 32 have an irregular shape; the portion connecting them to the tray 31 is Z-shaped, with the top of the Z-shape being a downward-sloping triangular structure extending towards the center of the tray 31. There are four electrodes 32 and four terminals 33, each electrically connected to the other, arranged in a rectangular configuration. Each electrode 32 is curved, with one end fixedly mounted on the tray 31 and the other end extending towards the center of the rectangle formed by the four electrodes. Terminals 33 are fixedly mounted on the tray 31 and are electrically connected to an external power source via a power cord. When the sample to be tested is placed on the tray 31, the irregularly shaped electrode is moved to cause it to elastically deform, and the tips of the four electrodes 32 are pressed onto the sample to be tested, so that the sample to be tested is stably fixed on the tray 31. Then the power is turned on, and the power supply is supplied to the electrodes 32 through the power line and the terminal 33, so that an electric field can be applied to the sample to be tested. At this time, the irregularly shaped electrode 32 will discharge at the tip, which will enhance the electric field around the sample to be tested.

[0053] Reference Figure 1 The controller and power supply should be placed as far away from the magnet as possible. The controller line and power supply line are connected to the cable box 11 through the displacement stage control interface 112 and the power interface 112, respectively. After being arranged in the cable box 11, they are then inserted into the inner sleeve 12 together with the optical fiber bundle and exited from the bottom of the inner sleeve 12.

[0054] Reference Figure 5 The fiber optic collimator 4 is installed inside the rod body 1 via a connecting frame 5, which includes a support column 51 and a connecting plate 52. The support column 51 is vertically installed inside the base 13 and located outside the focusing stage 2. The bottom end of the support column 51 is threaded into the rod body 1, and the top end is higher than the top surface of the sample holder 3. Both ends of the connecting plate 52 are equipped with fixing rings. One fixing ring is fixedly fitted below the threaded interface of the fiber optic collimator 4. When the other fixing ring is fitted at the top of the support column 51, the fiber optic collimator 4 is fixedly installed inside the rod body 1 and located directly above the sample holder 3. By removing the connecting plate 52 from the support column 51, the fiber optic collimator 4 can be disassembled and replaced, thus realizing a detachable connection between the fiber optic collimator 4 and the rod body 1.

[0055] Reference Figure 5 , Figure 7 The fiber optic collimator 4 includes a housing 41, a lens 42, and a polarizer 43. An FC / APC interface is located at the top of the housing 41. Both the lens 42 and polarizer 43 are fixedly installed inside the housing 41, with the lens 42 positioned above the polarizer 43 and its convex surface facing downwards. The bottom end of the inner sleeve 12 extends towards the fiber optic collimator 4 and is positioned close to it. The end connector of the fiber bundle is an FC / APC connector, which is fixedly installed on the interface 112 of the fiber optic collimator 4. When a laser beam is irradiated onto the fiber bundle, the laser beam passes through the fiber bundle and the fiber optic collimator 4 and irradiates the surface of the sample under test. At this time, the sample under test generates a test signal, which returns along the original path to the fiber bundle and then enters the detector through the output end of the fiber bundle. The detector includes a spectrometer and a fiber optic camera. The surface of the sample to be tested can be observed through the fiber optic camera. The position of the focusing stage 2 is adjusted by the controller so that the sample to be tested is moved to the laser spot. At this time, the height of the sample to be tested is kept on the focal plane of the fiber optic collimator 4. The angle of the focusing stage 2 is adjusted by the signal intensity measured by the spectrometer, thereby adjusting the angle between the sample to be tested and the horizontal plane, so that the light collection efficiency of the fiber bundle is optimized, thereby realizing microscopic spectral measurement.

[0056] Example 2

[0057] This embodiment also discloses a testing method using a tunable fiber bundle integrated optical measuring rod, comprising the following steps:

[0058] (1) Sample placement: When in use, after installing the fiber bundle, focusing platform 2, sample holder 3 and fiber collimator 4, the fiber bundle, laser line, detector line, power line and controller line are placed in the cable box 11. The fiber bundle, power line and controller line are passed out from the bottom of the inner sleeve 12. The connector of the fiber bundle is fixedly installed on the interface 112 of the fiber collimator 4. The power line is connected to the terminal 33 and the controller line is connected to the focusing platform 2. The assembly of the measuring rod is then completed.

[0059] Then, use low-temperature adhesive to attach the sample to be tested onto the tray 31, and move the electrode 32 to press it onto the sample. Similarly, use low-temperature adhesive to attach the sample holder 3 onto the focusing stage 2, so that the sample is located below the fiber collimator 4. Then connect the power cord to the sample holder 3, and finally put the measuring rod with the sample into the low-temperature strong magnetic field cavity to complete the placement of the sample.

[0060] (2) Debugging: Turn on the laser and let it shine on the input end of the fiber bundle. The laser shines on the surface of the sample under test through the fiber bundle and fiber collimator 4. The sample under test generates a test signal, which returns to the fiber bundle and then enters the detector through the output end of the fiber bundle. At this time, observe the surface of the sample under test through the fiber camera. Adjust the sample holder 24 horizontally through the controller to move the sample under test to the laser spot. Adjust the sample holder 24 vertically through the controller to keep the height of the sample under test on the focal plane of the fiber collimator 4. Then observe the signal intensity measured by the spectrometer. Adjust the angle between the sample under test and the horizontal plane by rotating the first rotating stage 22 and the second rotating stage 23 through the controller until the signal intensity measured by the spectrometer is the maximum. At this time, the light collection efficiency of the fiber bundle reaches the best, and the debugging is completed.

[0061] (3) Testing: After debugging, the sample to be tested is moved in a scanning manner on the focusing and positioning stage 2 according to the set detection area and interval step size. That is, after the information of each sample point is collected, the next measurement point of the sample to be tested is moved to the laser spot, realizing multiple single-point detection of the sample to be tested, thereby realizing microscopic spectral measurement. During the testing process, an adjustment is performed every 5-10 detection points to correct the deviation of the measurement point from the focal plane of the fiber collimator 4, ensuring that the acquired signal strength is kept at its maximum, which is beneficial to improving the signal-to-noise ratio.

[0062] Simultaneously, the power supply is turned on to provide power to sample holder 3 via the power cord, thereby applying an electric field to the sample under test. By changing the electric field strength, the electrical properties of the sample in the same magnetic field can be tested, thus achieving electrical measurement. Similarly, by turning on the laser, different fiber bundles can transmit the laser light, illumination light, etc. emitted by the laser, and / or perform imaging, realizing multifunctional transmission optical path testing using fiber bundles as carriers, and enabling multiple tests on the same sample under the same test conditions.

[0063] Operating principle and advantages: This application utilizes the information function of piezoelectric ceramics to convert mechanical energy and electrical energy. By controlling the voltage of the sample holder 24 and the two rotating stages through a controller, the position and angle of the focusing stage 2 can be adjusted, thereby moving the sample to be tested to the laser spot. This effectively solves the problem of sample defocusing, optimizes the light collection efficiency of the fiber bundle, improves the signal-to-noise ratio of the test, and achieves good light collection efficiency and high detection efficiency. Power is supplied to the sample holder 3 through the power line, and electrical measurements can be achieved by changing the electric field strength. Turning on the laser allows for the transmission of laser light, illumination light, signal light, etc., and / or imaging, realizing multi-functional transmission optical path testing with fiber bundle as carrier. It enables multiple tests on the same sample under the same test conditions, and is convenient to operate and has stable performance.

[0064] Example 3

[0065] Reference Figure 8 This embodiment discloses a tunable fiber bundle integrated optical measuring rod, which differs from Embodiment 1 in that: a through hole is provided at the center of the inner bottom surface of the cable box 11, through which the cable box 11 communicates with the interior of the rod body 1. An inner protrusion 113 is integrally formed on the inner bottom surface of the cable box 11. The cross-section of the inner protrusion 113 is annular, and it is concentric with the through hole, communicating with the bottom surface of the cable box 11 through the through hole. An inner sleeve 12 is inserted into the inner protrusion 113, and passes downward through the through hole out of the cable box 11 and into the rod body 1. An outer protrusion 121 is integrally formed at the top of the inner sleeve 12. The cross-section of the outer protrusion 121 is annular, and its outer diameter is approximately the same as the outer diameter of the inner protrusion 113.

[0066] Reference Figure 9 Both the outer protrusion 121 and the inner protrusion 113 have threads on their outer walls. When the outer protrusion 121 is supported on the inner protrusion 113, the same fixing nut 122 is threaded onto both the outer protrusion 121 and the inner protrusion 113, thereby achieving a fixed connection between the outer protrusion 121 and the inner protrusion 113, and thus fixing the inner sleeve 12 onto the cable box 11. During installation, the fiber optic bundle, power cord, and controller wire are threaded and arranged inside the inner sleeve 12. At the same time, the fixing nut 122 is screwed onto the outer protrusion 121. Then, the inner sleeve 12 is inserted into the inner protrusion 113 until the outer protrusion 121 is supported on the inner protrusion 113. Finally, the fixing nut 122 is tightened between the outer protrusion 121 and the inner protrusion 113, thus fixing the inner sleeve 12 onto the cable box 11. At this time, the fiber optic bundle, laser wire, detector wire, power cord, and controller wire are all arranged inside the cable box 11. When it is necessary to replace the cables of the fiber optic bundle or other optoelectronic components, the inner sleeve 12, fiber optic bundle, and optoelectronic component cables can be disassembled by loosening the fixing nut 122. The structure is simple and the operation is convenient.

[0067] Reference Figure 9A limiting groove 114 is formed on the inner wall of the inner sleeve 113, and a limiting block 123 is fixedly connected to the outer wall of the inner sleeve 12. The limiting block 123 and the limiting groove 114 are inserted into each other. When placing the inner sleeve 12, the limiting block 123 is aligned and inserted into the limiting groove 114. When the outer protrusion 121 is supported on the inner sleeve 113, the threads of the two are aligned, and the fixing nut 122 can be screwed on directly. At the same time, the limiting groove 114 restricts the limiting block 123, effectively preventing the outer protrusion 121 and the inner sleeve 113 from rotating relative to each other, ensuring the installation effect.

[0068] Reference Figure 9 A sealing gasket 14 is provided between the top cover 111 and the cable box 11, and a sealing ring 15 is fixedly connected to the inner wall of the interface 112. Both the sealing gasket 14 and the sealing ring 15 are made of rubber. When the cable of the optoelectronic element passes through the interface 112, the sealing ring 15 covers the optoelectronic element cable and abuts against the optoelectronic element cable, which can prevent the optoelectronic element cable from becoming loose or being cut or damaged by the interface 112. In addition, the sealing gasket 14 seals the gap between the top cover 111 and the cable box 11, and the sealing ring 15 ensures that each cable maintains a good seal with the interface 112 and the inner sleeve 12, thereby maintaining the airtightness of the measuring rod and preventing air from affecting the propagation of the laser in the fiber bundle, which is beneficial to improving the accuracy of the test results.

[0069] Operating principle and advantages: During installation, the fiber optic bundle, power cord, and controller cable are passed through and arranged inside the inner sleeve 12. The fixing nut 122 is screwed onto the outer protrusion 121. Then, the inner sleeve 12 is inserted into the inner protrusion 113 until the outer protrusion 121 is supported on the inner protrusion 113. Finally, the fixing nut 122 is tightened between the outer protrusion 121 and the inner protrusion 113, thus fixing the inner sleeve 12 onto the cable box 11. At this point, the fiber optic bundle, laser cable, detector cable, power cord, and controller cable are all arranged inside the cable box 11. When it is necessary to replace the fiber optic bundle or other optoelectronic component cables, the inner sleeve 12, fiber optic bundle, and optoelectronic component cables can be disassembled by loosening the fixing nut 122. The structure is simple and the operation is convenient.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tunable fiber bundle integrated optical measurement rod, characterized by: The utility model relates to a kind of optical fiber focusing positioning table, including rod body (1), optical fiber bundle, focusing positioning table (2), sample support (3) and optical fiber collimator (4), the rod body (1) is the shell made of carbon fiber, the head of the optical fiber bundle is fixedly installed in the top end of rod body (1), and the input end of the optical fiber bundle head is connected with laser, and the output end is connected with detector;Focusing positioning table (2) is fixedly installed in the bottom end of rod body (1), the position and angle of focusing positioning table (2) can be adjusted;To-be-measured sample is placed on focusing positioning table (2) by sample support (3) fixedly, and the power line for supplying power to sample support (3) is connected on the rod body (1);Optical fiber collimator (4) is fixedly arranged above to-be-measured sample, and the tail of the optical fiber bundle is fixedly installed on optical fiber collimator (4). The focusing positioning table (2) includes fixed seat (21) fixedly installed in the rod body (1), first rotary table (22) rotationally connected on fixed seat (21), second rotary table (23) rotationally connected on first rotary table (22) and sample seat (24) slidingly arranged on second rotary table (23), and the sample support (3) is fixedly installed on sample seat (24);First rotary table (22), second rotary table (23) and sample seat (24) are all made of piezoelectric ceramics, and the rod body (1) is externally provided with a controller for controlling the deformation degree of piezoelectric ceramics. A first U-shaped groove is formed on the top surface of the fixed seat (21), a second U-shaped groove is formed on the top surface of the first rotary table (22), the center axes of the first U-shaped groove and the second U-shaped groove are horizontal and perpendicular to each other, and the bottoms of the first rotary table (22) and the second rotary table (23) are in a U-shaped groove matching U-shaped. The voltage of the sample seat (24) is controlled by the controller to cause the friction coupling between the sample seat (24) and the second rotary table (23) to push the sample seat (24) to move horizontally or vertically, thereby adjusting the position of the sample seat (24); the voltage of the first rotary table (22) is controlled by the controller to cause the local deformation of the bottom of the first rotary table (22) and rotate around the X-axis in the first U-shaped groove; the voltage of the second rotary table (23) is controlled by the controller to cause the local deformation of the bottom of the second rotary table (23) and rotate around the Y-axis in the second U-shaped groove, thereby adjusting the angle of the sample seat (24), and further adjusting the position and angle of the focusing positioning table (2).

2. A tunable fiber bundle integrated optical measurement rod according to claim 1, characterized in that: The top end of the rod body (1) is fixedly connected with a cable box (11), a detachable top cover (111) is connected to the opening at the top end of the cable box (11), the top cover (111) is provided with an interface (112) for optical cables to pass through, and an inner sleeve (12) for arranging optical cables is mounted below the cable box (11), and the inner sleeve (12) is located in the rod body (1) and extends towards the optical fiber collimator (4).

3. A tunable fiber bundle integrated optical measurement rod according to claim 2, characterized in that: A sealing gasket (14) is arranged between the top cover (111) and the cable box (11), and a sealing ring (15) is fixedly connected to the inner wall of the interface (112) and the inner wall of the entrance and exit of the inner sleeve (12).

4. A tunable fiber bundle integrated optical measurement rod according to claim 1, wherein: The sample holder (3) comprises a plate (31), an electrode (32) and a terminal post (33), the sample to be measured is fixed on the plate (31), one end of the electrode (32) is fixed on the plate (31) and the other end is pressed on the sample to be measured, and the terminal post (33) is fixed on the plate (31) and electrically connected with the electrode (32) and the power line.

5. A tunable fiber bundle integrated optical measurement rod according to claim 4, characterized in that: The electrode (32) is made of a special-shaped copper sheet with a pointed end, and the pointed end of the electrode (32) is pressed on the sample to be measured.

6. A tunable fiber bundle integrated optical measurement rod according to claim 1, wherein: The optical fiber collimator (4) is detachably mounted in the rod body (1) through a support (51) and a connecting plate (52), the support (51) is screwed into the rod body (1), and one end of the connecting plate (52) is sleeved on the optical fiber collimator (4) and the other end is sleeved on the support (51).

7. A method of testing using the tunable fiber bundle integrated optical measurement rod according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) placing the sample: after the optical fiber bundle, the focusing positioning table (2) and the optical fiber collimator (4) are installed in the rod body (1), the sample to be measured is fixed on the sample holder (3), the sample holder (3) is fixed on the focusing positioning table (2), the sample to be measured is located below the optical fiber collimator (4), then the power line is connected to the sample holder (3), and finally the measuring rod with the sample to be measured is placed in the low-temperature strong magnetic field cavity; (2) debugging: the laser is turned on to irradiate the input end of the optical fiber bundle, the laser irradiates the surface of the sample to be measured through the optical fiber bundle and the optical fiber collimator (4), the sample to be measured generates a test signal, and the test signal returns to the optical fiber bundle and then enters the detector through the output end of the optical fiber bundle; At this time, the sample to be measured is observed through the detector, and the position of the focusing positioning table (2) is adjusted to move the sample to be measured to the laser spot, and the angle of the focusing positioning table (2) is adjusted to maximize the signal intensity; (3) testing: after the debugging is completed, the power supply is turned on to supply power to the sample holder (3) through the power line, the electric field intensity is changed to perform electrical measurement, the sample to be measured is moved to the laser spot according to the set detection area and interval step length, that is, after the information of one sample point is collected, the next measurement point of the sample to be measured is moved to the laser spot, and multiple single-point detection of the sample to be measured is realized.

8. The method of claim 7, wherein the method is applied to a tunable fiber bundle integrated optical measurement rod. In the step (3), the step (2) is debugged once every 5-10 detection points in the testing process.

Images